<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type="text/javascript" src="../js/demo05.js">

    </script>
</head>
<body>
    请输入一个数：<input type="text" id="num1">
    请输入二个数：<input type="text" id="num2"><br>
    <input type="button" value="+" onclick="jieguo1()">
    <input type="button" value="-" onclick="jieguo2()">
    <input type="button" value="*" onclick="jieguo3()">
    <input type="button" value="/" onclick="jieguo4()">
    结果:<input type="text" id="jieguo">
</body>
</html>